Hi,
the linux kernel has the ability to send simple network packets from a shell.
This sends a test message over udp port 515 to 10.254.10.10
michael@debdev ~ # echo "TEST MESSAGE" > /dev/udp/10.254.10.10/515
This also works for tcp.
michael@debdev ~ # echo "TEST MESSAGE" > /dev/tcp/10.254.10.10/80
Michael